Jose Malave said
With a multimeter set to DC you will be able to test for power, as for the power supply that you have it depends on how much amperage your cameras will draw, you could match the same amperage that your current power supply has, if you do not have the correct power supply, you can always get one from our site.
Okay, I was going to ask what a "multimeter" was, until I decided to google it. I don't have one of those. I didn't even know such a thing existed before today.
All I can tell you about the cameras is that they're generic cameras from Ebay. I don't know anything about them, nor how to find out what their "amperage" is. Aren't they all the same? I have no idea how to test them, nor where I'd do that. Do they have a test plug or something? If I remember right, they had two wires coming out of them. One that had one of those little plugs with a hole in the end of it, and one of those BNC things you mentioned. As it is, they're up on the sides of the house, and I can't get to them. Where would I look to find out what the power supply is? No manual or anything came with it. It was just this black plastic box with two cords in a little plastic bag. When I got the new DVR, it came with one too, and I unplugged the old one to use the new one.
I'm afraid you're going to have to stop treating me like I already know what to do. I know nothing about electricity or electronic things. Other than, "plug it in, and if it works, great. If not, get help". I wouldn't know a volt from an amperage if it bit me.
While I appreciate that you're actually trying to help, I don't follow 5% of what you're telling me. Could you please, please simplify things a lot more, and not assume that I have any idea what to do?